#!/usr/bin/env python
# coding=utf-8
from __future__ import absolute_import, division, print_function

import time
import unittest

from django.core.exceptions import ImproperlyConfigured
from django.http import HttpResponse
from django.test import RequestFactory
from django.views.generic import View, TemplateView, RedirectView

from tests import MongoTestCase as TestCase


class SimpleView(View):
    """
    A simple view with a docstring.
    """

    def get(self, request):
        return HttpResponse('This is a simple view')


class SimplePostView(SimpleView):
    post = SimpleView.get


class PostOnlyView(View):
    def post(self, request):
        return HttpResponse('This view only accepts POST')


class CustomizableView(SimpleView):
    parameter = {}


def decorator(view):
    view.is_decorated = True
    return view


class DecoratedDispatchView(SimpleView):
    @decorator
    def dispatch(self, request, *args, **kwargs):
        return super(DecoratedDispatchView, self).dispatch(request, *args, **
                                                           kwargs)


class AboutTemplateView(TemplateView):
    def get(self, request):
        return self.render_to_response({})

    def get_template_names(self):
        return ['views/about.html']


class AboutTemplateAttributeView(TemplateView):
    template_name = 'views/about.html'

    def get(self, request):
        return self.render_to_response(context={})


class InstanceView(View):
    def get(self, request):
        return self


class ViewTest(unittest.TestCase):
    rf = RequestFactory()

    def _assert_simple(self, response):
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.content, 'This is a simple view')

    def test_no_init_kwargs(self):
        """
        Test that a view can't be accidentally instantiated before deployment
        """
        try:
            SimpleView(key='value').as_view()
            self.fail('Should not be able to instantiate a view')
        except AttributeError:
            pass

    def test_no_init_args(self):
        """
        Test that a view can't be accidentally instantiated before deployment
        """
        try:
            SimpleView.as_view('value')
            self.fail(
                'Should not be able to use non-keyword arguments instantiating a view')
        except TypeError:
            pass

    def test_pathological_http_method(self):
        """
        The edge case of a http request that spoofs an existing method name is caught.
        """
        self.assertEqual(SimpleView.as_view()(
            self.rf.get('/', REQUEST_METHOD='DISPATCH')).status_code,
            405)

    def test_get_only(self):
        """
        Test a view which only allows GET doesn't allow other methods.
        """
        self._assert_simple(SimpleView.as_view()(self.rf.get('/')))
        self.assertEqual(SimpleView.as_view()(self.rf.post('/')).status_code,
                         405)
        self.assertEqual(SimpleView.as_view()(
            self.rf.get('/', REQUEST_METHOD='FAKE')).status_code,
            405)

    def test_get_and_head(self):
        """
        Test a view which supplies a GET method also responds correctly to HEAD.
        """
        self._assert_simple(SimpleView.as_view()(self.rf.get('/')))
        response = SimpleView.as_view()(self.rf.head('/'))
        self.assertEqual(response.status_code, 200)

    def test_head_no_get(self):
        """
        Test a view which supplies no GET method responds to HEAD with HTTP 405.
        """
        response = PostOnlyView.as_view()(self.rf.head('/'))
        self.assertEqual(response.status_code, 405)

    def test_get_and_post(self):
        """
        Test a view which only allows both GET and POST.
        """
        self._assert_simple(SimplePostView.as_view()(self.rf.get('/')))
        self._assert_simple(SimplePostView.as_view()(self.rf.post('/')))
        self.assertEqual(SimplePostView.as_view()(
            self.rf.get('/', REQUEST_METHOD='FAKE')).status_code,
            405)

    def test_invalid_keyword_argument(self):
        """
        Test that view arguments must be predefined on the class and can't
        be named like a HTTP method.
        """
        # Check each of the allowed method names
        for method in SimpleView.http_method_names:
            kwargs = dict(((method, "value"), ))
            self.assertRaises(TypeError, SimpleView.as_view, **kwargs)

        # Check the case view argument is ok if predefined on the class...
        CustomizableView.as_view(parameter="value")
        # ...but raises errors otherwise.
        self.assertRaises(TypeError, CustomizableView.as_view, foobar="value")

    def test_calling_more_than_once(self):
        """
        Test a view can only be called once.
        """
        request = self.rf.get('/')
        view = InstanceView.as_view()
        self.assertNotEqual(view(request), view(request))

    def test_class_attributes(self):
        """
        Test that the callable returned from as_view() has proper
        docstring, name and module.
        """
        self.assertEqual(SimpleView.__doc__, SimpleView.as_view().__doc__)
        self.assertEqual(SimpleView.__name__, SimpleView.as_view().__name__)
        self.assertEqual(SimpleView.__module__,
                         SimpleView.as_view().__module__)

    def test_dispatch_decoration(self):
        """
        Test that attributes set by decorators on the dispatch method
        are also present on the closure.
        """
        self.assertTrue(DecoratedDispatchView.as_view().is_decorated)


class TemplateViewTest(TestCase):

    rf = RequestFactory()

    def _assert_about(self, response):
        response.render()
        self.assertEqual(response.status_code, 200)
        self.assertContains(response, '<h1>About</h1>')

    def test_get(self):
        """
        Test a view that simply renders a template on GET
        """
        self._assert_about(AboutTemplateView.as_view()(self.rf.get('/about/')))

    def test_head(self):
        """
        Test a TemplateView responds correctly to HEAD
        """
        response = AboutTemplateView.as_view()(self.rf.head('/about/'))
        self.assertEqual(response.status_code, 200)

    def test_get_template_attribute(self):
        """
        Test a view that renders a template on GET with the template name as
        an attribute on the class.
        """
        self._assert_about(AboutTemplateAttributeView.as_view()(self.rf.get(
            '/about/')))

    def test_get_generic_template(self):
        """
        Test a completely generic view that renders a template on GET
        with the template name as an argument at instantiation.
        """
        self._assert_about(TemplateView.as_view(
            template_name='views/about.html')(self.rf.get('/about/')))

    def test_template_name_required(self):
        """
        A template view must provide a template name
        """
        self.assertRaises(ImproperlyConfigured, self.client.get,
                          '/template/no_template/')

    def test_template_params(self):
        """
        A generic template view passes kwargs as context.
        """
        response = self.client.get('/template/simple/bar/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.context['params'], {'foo': 'bar'})

    def test_extra_template_params(self):
        """
        A template view can be customized to return extra context.
        """
        response = self.client.get('/template/custom/bar/')
        self.assertEqual(response.status_code, 200)
        self.assertEqual(response.context['params'], {'foo': 'bar'})
        self.assertEqual(response.context['key'], 'value')

    def test_cached_views(self):
        """
        A template view can be cached
        """
        response = self.client.get('/template/cached/bar/')
        self.assertEqual(response.status_code, 200)

        time.sleep(1.0)

        response2 = self.client.get('/template/cached/bar/')
        self.assertEqual(response2.status_code, 200)

        self.assertEqual(response.content, response2.content)

        time.sleep(2.0)

        # Let the cache expire and test again
        response2 = self.client.get('/template/cached/bar/')
        self.assertEqual(response2.status_code, 200)

        self.assertNotEqual(response.content, response2.content)


class RedirectViewTest(unittest.TestCase):
    rf = RequestFactory()

    def test_no_url(self):
        "Without any configuration, returns HTTP 410 GONE"
        response = RedirectView.as_view()(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 410)

    def test_permanent_redirect(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_temporary_redirect(self):
        "Permanent redirects are an option"
        response = RedirectView.as_view(url='/bar/',
                                        permanent=False)(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 302)
        self.assertEqual(response['Location'], '/bar/')

    def test_include_args(self):
        "GET arguments can be included in the redirected URL"
        response = RedirectView.as_view(url='/bar/')(self.rf.get('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

        response = RedirectView.as_view(
            url='/bar/',
            query_string=True)(self.rf.get('/foo/?pork=spam'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/?pork=spam')

    def test_include_urlencoded_args(self):
        "GET arguments can be URL-encoded when included in the redirected URL"
        response = RedirectView.as_view(
            url='/bar/',
            query_string=True)(self.rf.get('/foo/?unicode=%E2%9C%93'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/?unicode=%E2%9C%93')

    def test_parameter_substitution(self):
        "Redirection URLs can be parameterized"
        response = RedirectView.as_view(
            url='/bar/%(object_id)d/')(self.rf.get('/foo/42/'),
                                       object_id=42)
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/42/')

    def test_redirect_POST(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.post('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_redirect_HEAD(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.head('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_redirect_OPTIONS(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.options('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_redirect_PUT(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.put('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_redirect_DELETE(self):
        "Default is a permanent redirect"
        response = RedirectView.as_view(url='/bar/')(self.rf.delete('/foo/'))
        self.assertEqual(response.status_code, 301)
        self.assertEqual(response['Location'], '/bar/')

    def test_redirect_when_meta_contains_no_query_string(self):
        "regression for #16705"
        # we can't use self.rf.get because it always sets QUERY_STRING
        response = RedirectView.as_view(
            url='/bar/')(self.rf.request(PATH_INFO='/foo/'))
        self.assertEqual(response.status_code, 301)
